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Building Materials - Section 7 Multiple Questions and Answers.
| 16. | The percentage of alumina and silica in good fire clay vary respectively is | ||
| A. | 25, 75 | ||
| B. | 30, 70 | ||
| C. | 35, 65 | ||
| D. | All of these. | ||
| 17. | The term frog means | ||
| A. | an apparatus to lift the stone | ||
| B. | a depression on a face of brick | ||
| C. | vertical joint in a brick work | ||
| D. | soaking brick in water. | ||
| 18. | Asphalt is obtained from | ||
| A. | petroleum distillation | ||
| B. | bitumen distillation | ||
| C. | plastic distillation | ||
| D. | none of these. | ||
| 19. | To retard the initial setting time of cement, the compound responsible, is | ||
| A. | Tricalcium silicate | ||
| B. | Gypsum | ||
| C. | Di-calcium silicate | ||
| D. | Tri calcium aluminate. | ||
| 20. | Stones used for rubble masonry must be | ||
| A. | soft | ||
| B. | hard | ||
| C. | light | ||
| D. | heavy. | ||
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